How to Prune Cleistocactus samaipatanus?
No pruning required

Cleistocactus samaipatanus · Cleistocactus samaipatanus
Grow under glass in a standard cactus compost, in full light. Provide low humidity. Water freely when in growth and keep completely dry at other times. Apply a dilute low nitrogen fertilizer fortnightly during late spring and summer
No pruning required